Door-spring.



No- 896,291. PATENTED AUG. 18, 1908.

DOOR SPRING.

APPLICATION FILED mam, 1908.

will

. Ewan Won D 1; Jaluzfll reiz JOHN A. FRETZ, OF PHILADELPHIA, PENNSYLVANIA.

DOOR-SPRING.

Specification of Letters Patent.

Patented Aug. 18, 1908.

Application filed March 31, 1908. Serial N 0. 424,350.

To all whom it may concern:

Be it known that I, JOHN A. FRETZ, a citizen ofthe United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Door- Springs, of which the following is a specification.

This invention relates to door springs, the object being to provide a door spring with very novel means for adjusting the tension of the spring, so as to suit different weight doors. j

A further object of my invention is to provide a check spring in connection with the operating mechanism so that the door will be prevented from slamming.

Another object of my invention is to provide a door spring which can be manufactured very cheaply, and one which is composed of a very few parts, which are so ar ranged and connected that they can be readily replaced by new ones when they become worn.

Another object of my invention is to provide a door spring which is very neat in appearance, and one which can be easily connected or disconnected.

These objects are obtained by the novel arrangement and construction of parts hereinafter fully described and shown in the accompanying drawings, in which Figure 1, is a side elevation of my improved door spring showing the application of the same to the door, one of the casings being removedi Fig. 2, is a similar view with the casing surrounding the main spring removed. Fig. 3, is a detail section through the bracket carried by the door showing a portion of the arm, and, Fig. 4, is a detail perspective view showing the manner of se curing the nut to the operating shaft and the arm to the nut.

In carrying out my improved invention I employ a pair of brackets A and B, adapted to be secured to the door frame at any desirable point, the brackets being provided with enlargements A, B, having vertical apertures, the aperture of the bracket A, being counter-bored to form an annular recess A in which is mounted the circular head of an operating shaft 0, which extends down through the bracket B, on which is a washer D, which is secured in place by an adjusting nut D, which is locked on the shaft by a set screw D extending transversely through the The bracket A, is provided with an opening to one side of the door in which is secured the upper end of a coil spring E, which surrounds the shaft, and has its lower end secured in a transverse bore formed in-the shaft, and it will be seen by mounting the spring in this manner it can be readily detached.

Secured to the door in horizontal alinement with the nut D, is a bracket F, provided with spaced ears F, between which is mounted an anti-friction roller F on which rests an operating arm G, having a threaded end adapted to be secured in one of the threaded bores of the nut, and it will be seen by changing the arm in the bores, the tension of the spring- E, can be adjusted so as to suit different weight doors.

To prevent the door from slamming, I provide a check spring H, arranged on the free end of the arm G, one end working against a washer I, mounted on the arm, which bears against the ears of the bracket, and the other end bears against a nut J, arranged on the threaded outer end of the arm, by means of which the tension of the same can be readily adjusted, and it will be seen by this arrangement the spring I, works against the spring E, so as to form a check. By arranging the spring on the opposite side of the ears, it can be made to hold the door open when desired.

The brackets A and B and shaft E, are inclosed by a casing K, which is secured thereon by screws K, and the bracket G, is inclosed by a casing L, secured thereon by screws L, these casings being used so as to make a neat appearance and prevent the dust and dirt from lodging on the same, it is of course, understood, that the spring will operate the same without the casing.

From the foregoing description it will be a rotatable spring actuated shaft, a nut rotatably mounted on the end thereof having means whereby it may be securedto the shaft to turn therewith, or detached from rotative engagement therewith, said nut having a series of radial bores in its sides, and an arm adapted to removably engage with any one of said bores, the outer end of said arm engaging with the door.

2. A door spring of the kind described having a pair of apertured brackets adapted to be secured to a door frame a vertical shaft mounted rotatably in said brackets, a spring surrounding said shaft and having one end secured to the shaft and the other secured to one of the brackets and acting to rotate the same, a many-sided nut on the lower end of said shaft having means whereby it may be secured to the shaft to turn therewith or detached from rotative engagement therewith, said nut having a plurality of radially extending bores, a bracket having spaced ears secured on the door in horizontal alinement with the bored nut, an anti-friction roller mounted thereon, an arm one end of which fits and is securable in any one of the bores in said nut, and a spring on the extremity of the arm engaging with said door bracket.

3. A door spring of the kind described having a pair of apertured brackets, the uppermost bracket being'provided with an annular recess surrounding the aperture thereof, a vertical shaft mountedrotatably in said brackets, the upper end of said shaft being provided with a head received within the recess of the upper bracket, the lower end of said shaft passing through the lower bracket,-a spring surrounding said shaft and having one end securedv to the shaft and the other end secured to one of the brackets and acting to rotate the shaft, a many-sided nut on the lower end of said shaft beneath the lower bracket, a set screw on said nut detachably securing it to the shaft, said nut having a pluralityof radially extending bores interiorly screw threaded, an arm one end of which is screw threaded to engage with any one of the screw threaded bores on the nut, a coil spring on said arm, a washer at one end of the spring and a nut on said arm located at the other end of said spring and bearing against the same, and a bracket having spaced ears secured on the door in horizontal alinement with the bore-nut, an anti-friction roller mounted between the ears of the bracket, the arm being adapted to be received between said ears and the spring and washer between the end of the ears and the extremity of the arm.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JOHN A. FRETZ.

Witnesses:

Tnos. H. J. KELLY, M. O. LYDDANE. 

